Process for producing noninflammable celluloidlike products



Fatented PATENT orrics,

OHS FAUSTEN, OF COLOGNE-ON-THE-RHINE,' GERMANY, ASSIGNOR TOIDEU'I'SGHE-SPGSTOFF ACTIEN-GESELLSCHAFT A comoRATIoN.

IN HAMBURG, 0F HAMBURG, GE MANY,

PROCESS FOR PRODUCING NONINFLAJVIMABLE CELLULOID LIKE PRODUCTS l in theProcesses for Producing Noninfiammable Celluloidlike Products, of whichthe following is a specification.

The invention relates to improvements in the rocess for producingnon-inflammable celluloid-like products, such as films used forprojecting animated screen and the like. i

It is well known that films made of acetylcellulose are' far inferior tothose made from nitro-cellulose as regards toughness. Acetylcellulosefilms when stored for any length of' time are furthermore liable tosplit off acetyl groups, which fact still further increases picturesupon a vtheir brittleness and also reduces the sensitiveness to light ofthe photographic layer.

The object of m inventioniis the elimina-- tion of this draw'liack. Myinvention consists in adding to the gelatinized, acetylcellulose or itssolution in acetone, acetic ether, alcohol, benzole and the like ormixturesof these solvents a small quantity, up to 5%, of anitro-cellulose, which possesses low viscosity and which is easilyhighly sol-' uble in the solvent chosen for the acetylcellulose.

It is a surprisin fact that this addition does not increase einflammabilityof the product made ,from this mixture. as compared withthose made from pure acetyloellulose, while the toughness and strength sconsiderably increased and the decomposition of the acetyl-cellulose andthe injurious efi'ect upon the layer .of emulsion is considerabldelayed.

In or er to bind the acetyl groups split- 1923. Serial No. 642,362:

ting off at higher temperatures acetyl group binding agents are added tothe mixtures,

such as 'amyl alcohol, which latterat the same times serves assofteningagent and imparts increased flexibility to the finishedproduct. 1

What I claim as my invention and desire to secure by Letters Patent is II 1. The process'for producing non-inflammable celluloid-like products,which consists in adding to gelatinized acetyl-cellulose an amount notexceeding five per cent ofnitrocellulose. 1 2. The process 'forproducing non-inflammable celluloid-like roducts, which consists inadding to a solution of aceyl-cellulose an amount up to five per cent ofnitro-cellulose:

3. The process for producing non-inflammable celluloid-like products,which consists in adding to a solution of acetyl-cellulose an amount upto five per cent ofa nitro' cellulose, which is oflow viscosity andwhich" is easily and highly soluble inthe solvent v I employed for theacetyl-cellulose.

4. The process for producing non-inflammable celluloid-like products,which consists in adding to 3rS0ll1t1OI1 of acetyl-cellulose an amountup to five per cent of a nitro-cellu lose, which is of low viscosity andwhich is easilyand highly soluble in the solvent employed'for theacetyl-cellulose and adding an acetyl group bindin agent to saidmixture.

5. The process of producing non-inflammable celluloid-like products,which consists in adding to gelatinized acetyl cellulose an amount uptofive per cent of a nitro-cellulose and adding amyl alcohol to suchmixture. i

In testimony whereof I have signed my name to this specification.

ALF ONS FAUSTEN.

